시 t E I 그 Atomic No 1281 Mass no CASIP 1 2 3 4 n my se 6 Elements Hydrogen (H Helium (4) lithium (li) Berylium (BE) Boron (B) Carbon (c) Nitrogen (N) Oxygen (0) Flaarine (F) Neon (Nes sodium (Na) Magnesium (My oma moto o e ㅋ 7 8 구 7 8 9 lo 11 11 11 12 12 12. 12